-94.11% is the change from 645 to 38
Calculation steps:
[( 38 - 645 ) ÷ 645] x 100 = -94.11%
Formula
Percentage change = [(38 - 645) / 645] x 100
Subtract the new number by the original number
38 - 645 = -607
-607 ÷ 645 = -0.9410852713178295
-0.9410852713178295 x 100 = -94.11%